I have a 94 mustang gt and my clock interior light speedometer don't work.
Also when you push the unlock button the park lights come on. Any idea where I should start ?

 

Electrical gremlins can be a major pain to track down. Did all this happen out of the blue, or did something change on the car ? New stereo, new alarm, remote start, etc ? All I can suggest for now is double check fuse box for blown fuses, verify any grounds you can find, even the connections by the battery. Do you have a multimeter for checking electrical current ?

 

Usually crazy problems like that are caused by grounds. Check what orange peel said first though. That should point you in the right direction.

 

check the grounds , try jumping the ground wire of something close maybe same part of harness to vehicle body , make sure it is a ground wire you are jumping though, if you jump it and everything comes to life put in a extra ground right there